Mechanism for cutting off molten glass



F. H. LOBB. l MECHANISM FOR CUTTING OFF MOLTEN GLASS.

APPLICATION FILED SEPTA?, 1917.

SFI@

3 nue/wko@ F. H. LOBB.

MECHANISM FOR CUTTING OFF MOLTEN GLASS.v

APPLICATION FILED sEPT.I1,I9I7.

1,388,654, Patented Aug. 23, '1921.

5 SHEES-SHEET 2.

APPLICATION FILED SEPT' I 7, 191 7.

F. H. LOBB.

MECHANISM FOR CUTTING OFF NIOLTEN GLASS.

Patented Aug. 23, 1921.

5 SHEEIS-SHLET 3.

F. H. LOBB.

MECHANISM FOR CUTTING OFF MOLTEN GLASS.

APPLICATION FILED SEPT-I7, 1917. 1,388,654. Patented Aug. 23, 1921.

5 SHEETS-SHEET 4.

V Bannay@ mRNA/w13 F H. LOBB.

MECHANISM FOR CUTTING OFF MOLTEN GLASS.

APPLICATION msn SEPLH. m7.

1,388,654, PatentedAug. 23,1921.

5 SHEETS-SHEET 5.

5 mme/who L UNITED STATE-s Par-ENT carica.

rnANx Hi 1.01313; on irrinnvrnnm Nnw-fannsnY, AssIGNon To UNITED BOTTLE Y l MAcHrNnnYco., or 'NEW YORK, N. Y., a oonronATIoN or NEW YORK.

f MEoHnNIsM ron c UavrIINe#orri/roLfrnN strass.Y

specification er Letters Pate-at. Patented Aug'.Y 23, 1921.

Application; nedsepember 17u-111.1%` Serial No. 191,665.

'- Beit kno\\'n.thatfI, FRANK H. Lone, a

and State ofv NewJersjey, `have invented certain new and.useful Improvements inl/fech-` anism for CuttingjOlf; Molten Grl'assf, of V which the following is aV specification.

- My invention-relates. to mechanism for.

cutting off 4molten glass, particularlyfor use in Vconnection withfmachines for manufacturing` glassV articles, fsuchf as for instance .glaSsbOt-tleS, by blowing, [pressing-'or other-- ',Wise.

In machinesfof this kind the molds on Vother receptacles which are to receive a charge of molten glass, aregenerally brought into registry with an outlet opening or nozzle provided in the :glass ftank or furnace; this- .nozzle is thenopened, and vafter `the desired Y amount of glass'has ,been withdrawn, theoutlet is .closed again, the moldremoved and. another moldor receptacle brought -into position.

Considerable difficulty has-been experienced hitherto vin properly corgilginating the.

bringing the molds. or other receptacles into :glassfreceiving position, and theY action ofv the Y cutting device in allowing a, certain to `Stand the intense heat?. to. whichit: is 'eX- Vposed without crackingor otherwise wearing. out too quickly.

One purposeof. my present inventionvjis to Vprovide reliableandj effectivemeans yforcausing the `cutting mechanism to be operated by" the mold-carrying machine .positively` and; at exactly theprope'r time. i

Another object. isi. to construct the' cutting 1 devicev or knife andsuppont it in such a way that it willbe; exposed to the Vheat of the molten glass in 'the furnace in apractically uniform man nerand 'will therefore not be liable to wear out prematurely. f

Y Still another object is to so construct and support the knife that itlwill alivaysbe in Y close contact with the plate or member in conjunction with,whichit performs its function of cutting-off thestream of molten glass.

A further object stomake the knife easily rf-7 of Fig. 6; `amountgof glassto flow into vsuch receptacle` and then cutting off thev stream ofgm'olten suitable manner.

of replacing it by a new one, withouthav-V ing-'towait until the knife and the parts connected with it have cooled olf.

`These andv other Aobjects and advantages `of my invention will be fully described hereinafter and will he claimed in the appended claims.

Reference is-to behad to the accompanying drawings in which- Figurelis anelevationof my improved mechanism, Withthe lowerpart insection on liner-.1 of Figs. 2-and 35 Y Fig. 2 is a view taken at right angles to Fig.- 1, looking in the direction of-the arrow 2 inFig.'l; Y

Fig. '3 is a plan. view, with parts in sectijon andother parts omitted or broken away for the, sake of clearness;

- lis a vertical section taken substan- `tially on line li-of Fig. 3, and shown on showing' the cutting mechanism in outside f.

View, certain. parts beingomitted from this `view lfor thev sake ofclearness; action. of Vthe Inoldfcarrying machine in j F ig. 6 is a section taken Von lineY 6)-6 of Figs. 3 and 4; l

Fig. 7 is a partial section taken yon line F ig. 8 is a detail bottom view mechanism proper;

Fig. 9 is a cross section taken on line V9 9 ofFig-8; l 1

Fig. 10 is a front view ofthe cuttingmechanism proper with parts lbroken away Vfor of the cutting the sake of clearness; and

Fig. l1 is a detail view, ywith tion online 11e-llly of Fig. 3.

Referring now tothe drawings,'the glass vtankor furnace' 20, of V,any approved construction, has in its `side wallan outlet 21 for the molten glass, controlledby agate `22, which outlet leadsinto a chamber or auxiliary furnace -23 built of fire-clay or other p arts in secrefractory materialv and supported on, or

connected with, the main furnaceQO inl any Preferably the auxiliary furnace 23 restson a bottom orfsolewplate 2 having a flange 25 surrounding the lower Vpart of the'auxiliary furnace 23. In the forward vpart of the auxiliary furnace 23 is located a preferably annular vertical wall '261, enclosing vertical Ydischarge-1 chamber Y place by a suitable plate 29 secured to the bottom plate 24 by screws 30 and large washers 3l, the screws extending through slots 32 which, as shown in Figs. 3 and 6, are considerably wider in one direction than the screws so as to enable the plate 29 to be shifted laterally with respect tothe plate 24 for thepurpose of adjusting the nozzle outlet to the proper position, the opening in plate 24 into which the nozzle 28 lits being of sufficient diameter or width to allow of such adjustment. ln a recess in the lower face of the plate 29 is secured a thin plate 33 in such a way that together with the adjacent portion of the plate 29 it forms a smooth surface along `which the cutting or shearing member is adapted to move. This thin plate 33 is provided with an opening 34 registering with the opening in the nozzle 28 and it therefore forms or becomes partl of the nozzle. In the drawings these openings havefbeen shown as being of circular cross section, but l do not wish to limit myself to this particular shape of outlet. ln Fig. 3, Ihave shown a top view of the plate 29 and the nozzle. The auxiliary tank 23 would not show in this view; it has, how-V ever, been indicated in dotted lines in order to show the relation between the plate 29 and the auxiliary 'tank 23 and also Ythe main tank 20, the wall of the latterl having been indicated in section at the extreme right in this view.

The cutting mechanism consists of a cutting member or knife 35 beveled on one side so as to form a sharp cutting edge 36; this cutting edge preferably conforms to a certain extent to the outline of the nozzle outlet and is preferably Vshaped, as shown best in Fig. 8. The knife or shearing member 35 has on its lower face a transverse projection or rib 37 fitting into a correspondingk groove or recess 38 formed in a supporting member 39. This recess 1s slightly wider and longer than the rib 37 so that the knife will be supported somewhat loosely by the member 39. As will be seen from Figs. 6 and 10, the bottom of the groove is straight,

Vwhile the lower surface of the rib 37 is curved or rounded toward both' ends so that the knife will be in contact with its support practically along a line only, viz: in the center of the rib 37. Att its forward end the knife supporting member or knife carrier 39 is ll also beveled, this beveled surface having its center line in the continuation of the center line of the beveled surface of the knife. The knife carrier 39 has laterally-extending studs 40 having square portions resting inv simi-V larly-shaped open top suckets41 of a U-shaped bracket 42 connected with the screw-threaded end of a rod 43 by means of which the cutting mechanism is operated in the manner described below. The rod 43 is supported inv a bearing 44preferably integral with a lateral extension 45 of the plate 29. This bearing will guide the rod 43 and therefore also to a certain extent the knife 35. In order to insure proper contact, however, between the knife 35 and the orifice of the nozzle 28, the knife is pressed against the nozzle by the following means: 0n the round ends of the studs 40 are journaled rollers 46 adapted to travel on tracks 47 pivotally supported at 48on posts 49 Vsecured to the extension 45 of the plate 29. At their other ends, the tracks 47 are engaged by springs 50 held in place by means of pins 5l screwed into the end portions of the tracks -47 and extending loosely through brackets 52 secured to the plate extension 45. It will be clear that the action of the springs 56 on the ends of the tracks 47 will press the track portions on which the rollers 46 travel, upward against these rollers, and this upward pressure will keep theknife or blade 35 in close contact with the lower surface of the nozzle 28. V

In order to further guide Ythe vknife 35 properly, thatis to prevent lateral movement of the knife carrier 38 and the knife, the plate 29 is provided at its lower surface with downwardly-projecting flanges 53 extending in a direction parallel to that in which the knife reciprocates. As shown in Fig. 6, these projections 53 form together' a Vguide for the knife carrier and prevent lateral movement of this carrier and of the knife. The knife 35 is provided with two longitudinal channels 54 and a transverse channel 55 connecting them, for vthe circulation of a cooling medium, which enters through one of two pipes 56, the other pipe forming an outlet for the cooling` medium. Both pipes are held together by a suitable clamp 57 and are connected to flexible tubes 58. Y

As shown in Figs. l, 3, 4 and 5, the free end of the rod 43 is-in screwthreaded engagement with a sleeve 59 to which are pivotally secured, at opposite sides, links 60, the other ends of which are pivotally connected at 6l with a lever 62. This lever, which is extended beyond'the pivot 6l to form a handle 63, is fulcrumed on the upper portion of a rock shaft 64, with which it is normally connected rigidly, so as to move in unison with this rock shaft. This connection is made by means of an arm 65 keyed tothe rock shaft 64 and provided at its free end with a sleeve 66 in which is slidably mounted a pin 67 normally pressed upward into a socket 68 in the lever 62 by a spring- 69. The pin 67 is provided with a milled Y secured to the plate iextens'ionll-r'eferred to l headby means of whichit canibe pulled out `of engagementv with-the socket 68'. Aslong as the pin 67iis inengagement with the socket 68, the lever 62. willy participateV in any movement ofthe lrockshaft'164; 'assoon however as the pin 67 rispulled outof engagement withi'thefso'cket1f68, the-lever62 =will become independent oftherock shaft 64 and can-be moved by handto any' desired position by means of the handle 63. F-Thisis K Y of advantage in-caseit is desiredlto stop the vop'era'tionlof the cut-off mechanism while Y -thefshaft 64 'continues to be rocked. To

prevent ithegpin' '67 from bein'gagain pushed 4intfrthe Vsocket'68, the lower end of the-pin 67 lis provided with a cross pin/Ofada'pted to engage' slots 71 in thel sleeve 66.` *Normally, that is, when-lever 62andfarm165 are Vinoperative' engagement, this cross pinrwill extend throughthe slots 71, as shown"` in: j Figs. l'rand 11; f When the pin: is-fpulled out of engagement withfthesocket 68, it is' given a slight turn around its axis, so that 5'" has, rigidlyconnectedftherewith, a lever 77 'carrying at it's'freeend ajroller 78` adapted to be engaged by cam surfaces'79'on disks' thecrosspin 70 will assumev the position shown in dotted lines in Figi 11, lying against the lower-surface ofthe sleeve" 6 6, and thuspreventing the engaging the socket'68. Y`

The rock shaft- 64.7 A'is supported at its' upper end in a bearing 72 on abracket v73 above, by meansof screws 74. The "lower end ofthe rock shaft. 64', whichis heldin bearings` forming part-offer carriedby a suitableqbottom'or foundation plate/76,

80. 'A Through Athese disks extends loosely a shaft 81, but the vdisks are held to rotate with said shaft in the following manner:

v The outer faces of these'disks, that is, those `opposite to the fcam'- surfaces, are formed with radial teethadapted to engage corre- ,spending radial sockets in7sleeves` 82, 83 y keyed to the shaft 81. Between thel two disks, the shaft `81.isfscrew-threaded, and on this screw-threaded portion4 are carried twonuts 8'whose purpose is to'presst'he Vdisks iirmly into lengagement with/"the lsleeves 82, 83 respectively, so asto compelV 5 these disks to'rotate with the shaft 81'. The

A`lever Z'Tis providediwith a downwardV projection VV85 resting on' an upwardextension 86 of the foundationplate 76, for thefpur pose of properly guiding this lever in its rocking movement. At one end, -tlieshaft 81 is supported in pin. 67 from again V96Y into awater tank (not shown).

uto afstationary .plate lor table 92. likewise forming Vpart of the mold-carrying machine justhreferred to. v Y

V'The mechanism forming the subject-mat `te'rof mypresent invention has been defvised chiefly forf yuse in connection with bottle-making machines of the well-known -type wherethe molds. or other-receptacles `whiehare'to receive aich'arge of liquid glass,

are i carriedon ia rotary 'table or support, the

movement ofeither the whole support or of the individual molds or other receptaclesV being-temporarilyfarrested when these molds or receptacles have reached` a position in which they can receive their charge of molten glass; In'Figsil and 3, 91 represents a portion of therotaryy part or table of rsuch machine, thisftable carrying the molds' or other receptacles inxany suitable manner (not shown), while'92'represents a AVAstationary' party of the same machine. One

ofrthemoldsV has been designated in Figs.. 1 andfby. the numeral 93. In .the lexample shown, the mold-carrying machine rotates about a VertiCal'aXis` passing through the* -xintersectionfof sectionilines 1-1 andG-G 'Ehezrelation betweenzthe number'of teeth thereby is such that for each mold brought into :position under the delivery nozzle, the shaft 81 will' make one revolution; if for example the machineL carries eight molds, the'shaft V81 will'rbe rotated eight times for one revolutionV ofthe mold-carrying Vmachine. y Y y The rock shaftl 64 is preferably made ilexi- -ble by means ofuniversal joints 94; this is 'done in view ofthe fact that the upper.. part 'of this shaft is 'carried by the auxiliary furnace23rwhichis liable to expand, while the lower part of this shaftis `carried by the foundation-plate 76y which is not likely to expand, atleast not to the same extent as the chamberf23. 1 I Inthe drawings, particularly in Figs. 1, .tand 6, I have shown interposed between the"mold'93 andthe delivery nozzle 28, a ltransfer funnel 95 `through which tlieglass issuing from the'nozzle will pass before it reaches the mold 93. Preferably integral `with this funnel is an Vinclined chuteV 96 which,`l` when (desired, can be moved into registry with the nozzle instead of the transfferfunnel 95so that 'the glass issuingfrom the nozzle 'will not drop into the mold, but

will'A-be led "away down the inclined Vchiite rlhe transfer funnel 95 and chute 96 and the mechanism foroperating them, however,

form no part Vof my present invention, and

A.they will therefore bef'described but briefly inthe presentA application.' As. shown in LFigs. 4, 5 and kofthe transfer funnel 95 is supported by guides 97 screwed to downward extensions 98 ofthe plate 29. (In Fig. 5, the funnel 95 has been omitted for the sake of clearness.) To the sides of the chute 96 are secured brackets 99- connected Vby a pivot pin 100 to one end of a link 101 the other end of which is pivotally'connected at 102 to a crank arm 103 rigidly secured to a rod 104 supported in a bracket 105 attached to the bottom plate 24 of the auxiliary furnace 23. To the outer Vend of the rod 104 is secured rigidly a lever arm 106 having at one end a Weight 107, and at the other end a sectorshaped portion 108,

' the straight or radial surfaces of which are f 95 Vto the left in Fig. 6, bringing the chute 96 into registry with the nozzle outlet 28. The transfer funnel is preferably watercooled, the water entering through pipe 110 and issuing through holes 111V into thechute 96 along which it flows down into the water tank referred to above.

The operation of my improved mechanism is, briefly described, as follows: With the parts in the position shown in Figs. 1, 3, 4,

I 5 and 6, the blade or knife'35 closes the outlet in the nozzle 28 `so that no molten glass will issue from the discharge chamber 27. As described above, theshaft 81 is rotated through the rotating movement of the table 91 carrying the molds or other receptacles which are to receive a charge of molten glass. As soon as the raised cam portion on the left- Vhand disk 80 pushes the roller 78 on lever 77 over toward the right (Fig. 3), the shaft 64 will be rocked and this will cause the knife 35 to be withdrawn from the nozzle outlet and allow molten glass to flow out and drop through the transfer funnel 95 into the mold or other receptacle, which at this time will v be in receiving position. The two cam surfaces on the disks 80 are so arranged that as soon as the desired amount ofvmolten glass has been withdrawn or dropped into the mold or other receptacle, the cam surface on the rifrht-hand disk 80 willagain push the roller78 over toward the left (Fig. 3), causing the shaft 64 to be rocked and the blade or knife 35 to cut off the stream of molten glass issuing from the nozzle outlet 28.

The length of time during which the blade 35 is withdrawn from the nozzle opening and the glass allowed to flow out, can be regulated atvwill lby adjusting the cam surfaces on the disks 80 with respectto each other.V For this purpose, the nuts 84 are prematurely.

loosened and the disks 80 slid out of engagement with the sleeves 82, 83, whereupon the disks can be turned until the cam surfaces have the proper relation to each other. rlhe nuts 84 are then tightened again and theV disks will be securely held in the positions to which they have been adjusted, owing to the engagement of their toothed surfaces with the corresponding surfaces on the sleeves 82, 83.

If for any reason the glass supply should have to be stopped suddenly before the moldv carrying machine can be brought toa standstill, this can be done quickly by pulling the pin 67 out of the socket 68 and moving the blade 35 by means of the handle 63 to a position in which it will close the nozzle outlet. The mold-carrying machine may then continue to run without operating the knifemechanism, the small cross pin 70 preventing the pin 67 from returning into engagement This procedure may be follow-ed for instancr-n` if after-the machine has been in operation a certain length of time it is desired to stop working. In this case, the gate 22 will first be closed, then the'nozzle outlet opened, and all the molten glass contained in the-auxiliary furnace 23 is allowed to flow out and down the inclined chute 96, which has been brought into position under the nozzle in the Ymanner described above.

The mechanism employedby me for oper ating the glass-cutting device is positivelyacting and is much more effective and reliable than for instance pneumatic means ccmmonly employed for this purpose. AnotherV important advantage of my. invention resides in the special construction of the knife and the manner ofsupporting it. ln devices of this kind, great diliiculty has been experienced in findingA a suitable closing means for the outlet nozzle, which will stand` the intense heat to which it is exposed during the time that the outlet is closed, without cracking or otherwise wearing out By supporting the knife or closing means in the manner shown and described, that is, by providing it with a rib or projection fitting into a corresponding groove in the knife carrier, l am enabled to make the knife of relatively small surface area, and especially of a considerably smaller length (in the direction of its movement) than has been possible hitherto with a knife connected to its operating mechanism at its rear end. A small knife, that is, a narrow 'and shortgknife, iS' exposed to theheat more i Vuniformly than a knifebf larger surface area, which latter is nicreliable to cracking ron ac oilnt;ofthe-.difference 1n temperature `betvveenthe :inner portions; in actual. contact' Withthe molteny glass A'and the outer portions Which-. are moreremote fromthenoaile out-v letv andy therefore? heated to. a considerably smaller degree..V A smallknife Will there- -fore give much bettervvear than a large one. .'Another advantage .ofusing a small knife supported. loosely and@ being in contact V`with its carrier-alongV a line only, `isthat-,it will'A klie more closelyfagainst the plate on which it:

is adapted;VV to". slideand` in" conjunction with Whichfiteutsfthe. stream of Y molten glass.V

This plate is liableto Warp f considerably owing .to` the intense heat ofthe moltenglass inthe furnace, and a` small knife which is pressed-against jsuch plate and. supported in surface of the plate; in.any.,event, itwill do larger sur-facev area;

^ v Stillianother..advantage ef my nevv.V manner of supporting the'iknife is the .ease With Whioi-i the knifeeanbeinspected, .removed Vfor repair o1 replace'drwth a new ene(V All thatl is necessary forxithis purpose is toremove l Athe' pins 5.1 in Athe f'ends of; tracks ,47,

their .pivotsASV until .either .thellmife itself canbe'lifted from-itsrgcarrier, for this carrier togethervvith-- the knife canbe lifted out of engagementgvviththe U-shaped bracket 42 after i disconnecting the latter vfrom vrod A3, I nffeither-(case,r` thejpipes-. Will ofl course have-ntofbe disconnectedfrom the gflexiblef tubes 5 8. ItE is;V also obvious that `before the carrier, or 'lifting 'this support outvof. the

@Shaped-bracket, 1 the :heated Condit-,ion of these parts gdoes; fnot Ymoval offftheknife. Iy claimas my invention .interfereavvith the re..-

a.fdscherge chamber havin-ng :en outlet, .a

loWer ..surfac e withla ribf-transverse tothe located `.under the shearing:memberzand-hav- Whereu on these. tracks. cangbe svvund on.

- 1. Infga deziceef the character described,-V

shearing member movable across .and in con- 2- tact fvvithgsaid .outletand provided Von-its ing a transverse groove invvhich` said rib is seated to compel Vsaidmember and carrier to nuevel in unison across the outlet and; to prevent the shearing member Vfrom turning rela-l tively to the carrier about a vertical axis, and means for moving said carrier.

2. In adevice of the characterv described, a discharge memberv having an outlet, a shearing member movableacross and in contact with said outlet and provided With a transverse ribv on its lower surface, the bottom of said frib beingV curved, .a carrier locatedrnnder the shearing member and. having a transverse groove With a surface engagedby. said'rib along a single line parallel to the path of the shearing member, `and mea-ns for movingsaid carrier.

Ina device of'tlie.y character described, 'a discharge member having an `outlet, a shearing member movable acrossandin contactfwith sai-,d outlet, a carrier .with which the shearing `member is connected loosely to rock relatively theretoxvhereby. the shearing f member: isv enabled tofadapt itself to irregulongen-knife. A- small knife such as Lam. enabled to `bymy invention, will there* Y,

-foregmakefaifeleanr .cut than a knifeiof,

larities in.` the shape .of the cOPerating outlet,-surface,.and means for. moving said car-V rier.

e. Y,In a device ofv the .character described,

a .discharge'member .having ,an ..0utlet, .a

Arelatively' thereto about an .axis parallel. to

the path ,of theshearingmember whereby the. shearing .member 4is enabled toadaptitself'to irregularities in theshape. ofthe cooperating outlet surface, and means, for ,mov-

1. ing said carrier..

A5, `1n a device Iofy ,the .character described, al, discharge member having ,fan A outlet, a shearing member.,movablefacrossand in con-4 tact with said -,out1et .a carrierV locatedfon the side of theshearing member opposite .to that facingthe outlet, said carrierandshearing member being provided,. yon their adj acent surfaces, vvithv c operating rib andugroove shearing member, to compelsaid member and carrier toy move 1n umsonlacross .said outletavhile preventing the, shearing .member from turning relatively to thecarrier about an axis transverseto the path of thelshearing member, and means for .moving said carrier.

6.,In. a .device cf the character described,

a discharge chamber having anf outlet, .a

shearing'. memberY movableacross said outlet,

and `havingfa V shaped beveled cutting edge, .a carrier for saidshearing member provided with an inclinedsurface. alining with that portionof the cutting edge which means for moving said carrier.

"7. In a device of the character described, a discharge Achamber having` an outlet, a

forms the angle or corner. of the ..V,V and.

formations .transverse ltothe pathy of the j shearing member movable across said outlet, a carrier for said shearing member, provided with lateral studs, a forked bracket engaging said studs, and means for moving said bracket.

8. In a device of the character described, a discharge chamber having an outlet, a shearing member movable across said outlet, a carrier for said shearing' member, providedwith lateral studs, a forked bracket engaging said studs, rollers mounted on the studs, a track-'on which said rollers are adapted to travel, and means for moving said bracket.

V9. In a device of the character described, a discharge chamber having an outlet, a shearing member movable across said outlet, a carrier in which said shearing member is seated loosely, a track on which said carrier is movable, said track itself being movable toward and from the outlet, means for pressing the track toward the outlet, and means for moving the carrier. Y

10. In a device of the character described, a discharge member having an outlet, a shearing member movable across and in contact with said outlet, a carrier located on` the side of the shearing member opposite to that facing the outlet, said carrier and shearing member being provided, on their adjacent fges, with cooperating rib and groove formations transverse to the path of theVV shearing member, said rib being in contact with the groove along a single line parallel to the path of the shearing member, and

the shearing member being adapted to rock on the carrier transversely of said path,

and means for moving the carrier.

V11. In a device of the character described, a discharge member having an outlet, a shearing member movable across and in contact with said outlet, a movable carrier for` said shearing member, the said carrier and vshearing member being provided, one with al ribextending transversely of the path of they shearing member and curved in said directionat its free surface, and the other with a transverse groove Vwith the surface of which said curved surface of the rib is in rocking engagement, and means for operating said carrier.

12. In afdevice of the character described, a discharge member having an outlet, a shearing member movable across and in contact with said outlet, a movable carrier for said shearingmember, the said carrier and shearing memberbeing provided, one with a rib exten-ding transversely of the path of the shearing member and curved in said direction at its free surface, and the other f with a transverse groove having a plane sura discharge member having an outlet, a shearing member movable across and in contact with said outlet, a carrier located on l the side of the shearing member opposite to that facing the outlet, said carrier being in loose engagement with the shearing member so that the latter can be separated from the carrier by moving one relatively to the other in a direction transverse to thepath of the carrier, and means for operating the carrier. 14. In a device of the character described,

a discharge member having anl outlet, a shearing member movable across Vand in conpermit of the ready separation of the shear'- 1 ing member from its carrier by moving one relatively to the other in a direction transverse to the path of the carrier, and means for operatingthe carrier. Y

15. In a device of the character described, a discharge member having an outlet, a

shearing member movable across said outlet,

stationary guides for preventing lateral movement of the shearing member while allowing it to move'across said outlet and also toward and from the outlet, a track engaged by said shearing member and movable toward and from the outlet relatively to said stationary guides, means for pressing said track toward the outlet, and means for operating the shearing member.

16. In a device of the character described, a discharge chamber having an outlet, a 'shearing member movable across said outlet, an actuating rock shaft having an arm oscillating therewith, a lever operatively connected with said shearing member and mounted to rock about the axis of said shaft, and means for connecting said arm and lever for joint movement or disconnecting them to allow the rock shaft to oscillate without operating the shearing member.

17 In a device of the character described, a discharge chamber having an outlet, aA

to the axis of the rock shaft to connect the arm and lever for joint movement or disconnect them to allow the rock shaft to oscillate without operating the shearing member.

18. In a device of the character described, a discharge chamber having Van outlet, a shearing member movable across said outlet, an actuating rock shaft having an arm oscillating therewith, a lever operatively con'- nected withVv said shearing member Vand mounted to roel about the axis of said shaft, a connecting pin carried by one of said rocking elements-` and movable parallel to the axis of the rock shaft to connect or dis-' connect said arm and lever, and a spring tending to hold said pin in thefconnecting position. Y

19. In a device ofthe character described, a discharge chamber having an outlet, a shearing'member movable across said outlet,

an actuating rock shaft having an arm oscillating therewith, a lever operatively con-V 'nected with Y said shearing member and mounted to rook about the axis of said shaft, a connecting pin carried by one of said rocking elements and movable parallel to the axis of the rock shaft to connect or disconneet the said arm and lever, said pin being also mounted to turn about its own axis, the

pin andthe element carrying it having mating formations which prevent the longi- Y tudinal motion of the pin tothe connecting lengthwise to itsconnecting position.

In testimony whereof I have signed this speoiication.

Y FRANK H. LoBB.

position when the pin is turned to a certain 

